@app.get("/query/int/optional")
def get_query_type_optional(query: Optional[int] = None):
    if query is None:
        return "foo bar"
    return f"foo bar {query}"


@app.get("/query/int/default")
def get_query_type_int_default(query: int = 10):
    return f"foo bar {query}"


@app.get("/query/param")
def get_query_param(query=Query(default=None)):
    if query is None:
        return "foo bar"